cp's OEIS Frontend

A261697 Irregular triangle read by rows in which row n lists the odd divisors of n in the ordering given by A261699.

%I A261697 #32 Jul 29 2017 12:07:33
%S A261697 1,1,1,3,1,1,5,1,3,1,7,1,1,9,3,1,5,1,11,1,3,1,13,1,7,1,15,3,5,1,1,17,
%T A261697 1,3,9,1,19,1,5,1,21,3,7,1,11,1,23,1,3,1,25,5,1,13,1,27,3,9,1,7,1,29,
%U A261697 1,3,15,5,1,31,1,1,33,3,11,1,17,1,35,5,7,1,3,9,1,37,1,19,1,39,3,13,1,5,1,41,1,3,21,7,1,43,1,11,1,45,3,5,15,9
%N A261697 Irregular triangle read by rows in which row n lists the odd divisors of n in the ordering given by A261699.
%C A261697 Positive terms of A261699.
%C A261697 Note that this ordering is unusual.
%C A261697 Row lengths give A001227.
%C A261697 Row sums give A000593.
%C A261697 Another version of A182469 from which differs at a(14), or T(9,2).
%C A261697 For a similar version see A261698 from which differs at a(34), or T(18,2).
%e A261697 List of divisors of 45 from distinct sequences:
%e A261697 45th row of triangle A182469: 1, 3, 5, 9, 15, 45.
%e A261697 45th row of triangle A261698: 1, 45, 3, 15, 5, 9.
%e A261697 45th row of this triangle...: 1, 45, 3, 5, 15, 9.
%e A261697 Triangle begins:
%e A261697   1;
%e A261697   1;
%e A261697   1,  3;
%e A261697   1;
%e A261697   1,  5;
%e A261697   1,  3;
%e A261697   1,  7;
%e A261697   1;
%e A261697   1,  9,  3;
%e A261697   1,  5;
%e A261697   1, 11;
%e A261697   1,  3;
%e A261697   1, 13;
%e A261697   1,  7;
%e A261697   1, 15,  3,  5;
%e A261697   1;
%e A261697   1, 17;
%e A261697   1,  3,  9;
%e A261697   1, 19;
%e A261697   1,  5;
%e A261697   1, 21,  3,  7;
%e A261697   ...
%Y A261697 Cf. A000593, A001227, A027750, A182469, A261698, A261699.
%K A261697 nonn,tabf
%O A261697 1,4
%A A261697 _Omar E. Pol_, Sep 21 2015